Introduction: Genetic data hypothetically place the origin of the most recent common ancestor of the subfamily Emballonurinae in Africa, suggesting a dispersal event from Africa to South America during the Oligocene (30 Ma), and a subsequent allopatric radiation in the New World. Emballonurid genera exist in Central America where, to date, only one event of diversification has been documented for Balantiopteryx before the completion of the Isthmus of Panama land connection in the Pliocene. Methods: Emballonurid bats constitutes an important element of the bat fauna in Colombia. Herein, museum voucher specimens were used as primary source to generate a checklist of emballonurid bats from Colombia. In addition, selected museum voucher specimens were analyzed to verify their identifications. The checklist is accompanied by references as well as models of potential distribution for each Colombian emballonurid species. These distribution maps were used to investigate the affinities, in species composition, among Colombian ecoregions as outlined by Hernández-Camacho et al. (1992), and to determine emballonurid richness distribution in Colombia and the relationship between environmental variables and patterns of species richness in this group of bats in the country. Results: We report 16 confirmed emballonurid bat species for Colombia and three species potentially present in the country, for a total of 19 species representing the eight recognized Neotropical emballonurid genera. At 16 known species, Colombia has the second greatest number of Neotropical emballonurid bats after Brazil (17 spp.). Discussion and conclusion: The checklist presented herein is accompanied by 11 taxonomic and distributional comments explaining recent changes in taxonomy, species distribution rearrangements, as well as clarifications and a refinement of the previous records for Colombia. In addition, Geographic Information System (GIS) models of potential distribution were created for all confirmed species in Colombia, and species richness patterns were analyzed. Finally, in a Parsimony Analysis of Endemism was performed for Colombian emballonurids we found that diversity within this group of bats in geographically subdivided in Colombia into four main regions including: The Biogeographic Chocó; the Magdalena Valley; The Orinoquia; and the Guianan-Amazon region.

No abstract

Studying the variables that describe the spatial ecology of threatened species allows us to identify and prioritize areas that are critical for species conservation. To estimate the home range and core area of the Endangered (EN) Amazon river dolphin Inia geoffrensis, 23 individuals (6♀, 17♂) were tagged during the rising water period in the Amazon and Orinoco river basins between 2017 and 2018. The satellite tracking period ranged from 24 to 336 d (mean ± SE = 107 ± 15.7 d), and river dolphin movements ranged from 7.5 to 298 km (58 ± 13.4 km). Kernel density estimates were used to determine minimum home ranges at 95% (K95 = 6.2 to 233.9 km2; mean = 59 ± 13.5 km2) and core areas at 50% (K50 = 0.6 to 54.9 km2; mean = 9 ± 2.6 km2). Protected areas accounted for 45% of the K50 estimated core area. We observed dolphin individuals crossing country borders between Colombia and Peru in the Amazon basin, and between Colombia and Venezuela in the Orinoco basin. Satellite tracking allowed us to determine the different uses of riverine habitat types: main rivers (channels and bays, 52% of recorded locations), confluences (32%), lagoons (9.6%), and tributaries (6.2%). Satellite monitoring allowed us to better understand the ecological preferences of the species and demonstrated the importance of maintaining aquatic landscape heterogeneity and spatial connectivity for effective river dolphin conservation.

No abstract

regiones biogeográficas y es poco conocida. Por lo tanto se emplearon técnicas de fototrampeo para el registro de los mamíferos medianos y grandes asociados al bosque ribereño en la cuenca alta y media del río Bita, Vichada, Colombia. Se estimó la diversidad, el índice de abundancia relativa y los patrones de actividad. Se instalaron 77 cámaras trampa a lo largo de 200 km del río en dos periodos hidroclimáticos (baja y alta precipitación). Se obtuvieron en total 16439 imágenes, con un esfuerzo de muestreo de 7700 días-trampa. Se registraron 24 especies de mamíferos, agrupados en 17 familias y 9 órdenes. El índice de diversidad de Shannon-Wiener obtenido a través de este método fue H´= 1,995, las especies mejor representadas a través del índice de abundancia relativa fueron Tayassu pecari (IAR = 0,176, n = 1360), Cuniculus paca (IAR = 0,174, n = 1346), Tapirus terrestris (IAR = 0,144, n = 1114) y Dasyprocta fuliginosa (IAR = 0,116, n=900). En términos de patrones de actividad Dasyprocta fuliginosa presentó patrones de actividad diurnos, Leopardus pardalis catemeral, Tayassu pecari crepuscular matutino, Cuniculus paca y Didelphis marsupialis nocturna y Tapirus terrestris crepuscular vespertino. Esta información puede ser de utilidad para la generación de programas para el manejo y conservación de la mastofauna en la cuenca del río Bita. Palabras claves. Cámaras trampa. Conservación. Escudo Guayanés. Orinoquia colombiana.